=== GraphViz Export ===
Avalog supports exporting to the GraphViz format for visualization.
graph expands all facts and exports data
graphf "<file>" sets output file
no graphf uses ".dot" after last imported file,
or "tmp.dot" if there is no imported file
graphl "<layout>" sets layout GraphViz algorithm
List of layout algorithm:
dot hierarchial directed graphs
neato spring model using energy
fdp spring model using forces
sfdp multiscale fdp
twopi concentric circles
circo circo